Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Chapter 37, Problem 5SQ
To determine
Find the reason why the motor does not accelerate to fourth speed.
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(B)- Indicate whether the following statements are true or false and correct the false
statements
1- Wave wound armature has two parallel paths.
2- The current ratio is equal to 1/ turn ratio at no-load while the voltage ratio is
equal to 1/ turn ratio at full load
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3-When a series de motor is operated without a load, the armature draws
excessive
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4- The hysteresis loss can be minimized by using core of thin laminations
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c) Based on Figure 3 (c), a basic DOL starter induction motor at a power station is
experiencing run-time error and unable to start, based on your understanding,
interpret the sequence of troubleshooting shall be carried out to identify the root
cause of the abnormalities.
3P
1P
MCB
MCB
STOP
K1
START
MOTOR
Figure 3 (c)
For the Starting Up the Power Station Simulator
Why are certain operations blocked by isolators
Chapter 37 Solutions
Electric Motor Control
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- 3 Phase Induction motor I want a short answer please 11. The number of three-phase induction motor parts and the function of each part. 12. How to know the terminals of an induction motor if they are not encoded in the terminal box. 13. How can a three-phase induction motor be reversed? 14. Number of tools used to protect devices - transformers and induction motors - in the laboratory. 15. The number of devices required to conduct a test No load. for a three-phase induction motor 16. The number of devices required to conduct a test For a three-phase induction motor, a Blocked rotor 17. What is the use of a test? For a three-phase induction motor? Blocked rotor and No load 18. When conducting the no-load test, the current rises in the first second of preparation when using the direct connection method. the reasons for that? 19. When performing a non-pregnancy test, we notice a decrease in the ability factor. the reasons for that? 20. Connect an induction motor directly to the source.…arrow_forwardQ3/ Chose the correct answer for the following 1. Synchronous motors are generally not self-starting because (a) the direction of rotation is not fixed (b) the direction of instantaneous torque reverses after half cycle (c) startes cannot be used on these machines (d) starting winding is not provided on the machines 2. The power developed by a synchronous motor will be maximum when the load angle is (a) Zero (b) 45° (c) 90° (d) 120° 3. An over-excited synchronous motor takes (a) leading current (b) lagging current (c) both (a) and (b) (d) none of the above 4. In a synchronous motor, the magnitude of stator back e.m.f. £& depends on (a) d.c. excitation only (b) speed of the motor (c) load on the motor (d) both the speed and rotor flux 5. A pony motor is basically a (a) small induction motor (c) D.C. shunt motor (b) D.C. series motor (d) double winding A.C./D.C. motorarrow_forwardMultiple choices cont.: c. The 3M load contacts are welded shut. d. The normally open 3M contact between wire numbers 23 and 31 is hung closed.arrow_forward
- Explain how the following adjustments are made in a single phase induction type energy meter: (a) Lag adjustment (b) Adjustment for friction compensation (c) Creep (d) Overload compensation (e) Temperature compensationarrow_forwardPlease solve this question in control system quicklyarrow_forward1- What is the starting torque developed by a split-phase or a capacitor start motor? 2- What is the current in-rush at the time of starting the motor? Does it cause severe fluctuations on the line?arrow_forward
- Assume all of the timers are set for a 3 second delay. When the start button is pressed, nothing happens. None of the motors start. Which of the following could NOT cause this problem. a Overload contact OL1 is open b 1CR relay coil is open c 2CR relay coil is open d The stop button is openarrow_forwardOne type of failure that's more common with 200 HP motors than with 10 HP motors is A. rotor bar failure.B. contactor failure.C. bearing failure. D. stator failures.arrow_forwardQuestion No.26 The full load slip of 60 Hz, 12 pole squirrel cage induction motor is 5%. Its full load speed isarrow_forward
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